中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | trisnorcybrodolide | 74973-61-8 | C12H14O3 | 206.241 |
—— | methyl 3-(2-acetoxyethyl)-6-methoxymethyl-2,4-dimethylbenzoate | 74973-60-7 | C16H22O5 | 294.348 |
—— | methyl 3-(2-hydroxyethyl)-6-methoxymethyl-2,4-dimethylbenzoate | 79801-58-4 | C14H20O4 | 252.31 |
—— | methyl 3-(2-(tetrahydro-2H-pyran-2-yl)oxyethyl)-6-methyoxymethyl-2,4-dimethylbenzoate | 74973-59-4 | C19H28O5 | 336.428 |
—— | Acetic acid 4-(2-acetoxy-ethyl)-2-((Z)-3-acetoxy-2-methyl-propenyl)-3,5-dimethyl-benzyl ester | 75225-93-3 | C21H28O6 | 376.45 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | trisnorcybrodolide | 74973-61-8 | C12H14O3 | 206.241 |
The isolation and structure determination of the "cybrodins", a new group of sesquiterpenoids produced by a new strain of the bird's nest fungus Cyathus bulleri, is reported. Cybrodol (3), isocybrodol (4), cybrodal (5), trisnorcybrodolide (6), and cybrodic acid (7) may be classified as seco-illudalane sesquiterpenes. The evidence leading to the structural assignments is presented, along with chemical correlations among the cybrodins. The possible mode of biogenesis is discussed. Pterosin-C (13), a known norsesquiterpene, and 3-methyllumichrome (17) were also isolated. Small quantities of a new sesquiterpenoid, broderol, believed to possess structure 21, were obtained on two occasions.
The total syntheses of cybrodol (1), isocybrodol (2), cybrodal (3), cybrodic acid (4), and trisnorcybrodolide (5), starting from 2-bromomesitylene (6) are described. The route involves oxidation of the 5-methyl group of 6 by means of chromyl acetate, addition of the β-hydroxyethyl chain by aryllithiation and reaction with ethylene oxide, and addition of the fifth carbon substituent by aryllithiation and treatment with ethyl chloroformate to give the key intermediate, methyl 3-(2-hydroxyethyl)-6-methoxymethyl-2,4-dimethylbenzoate (18d). The latter was transformed into trisnorcybrodolide (5), and further elaborated via the corresponding aldehyde 21 into the remaining cybrodins.